diff --git a/src/main/java/org/springframework/data/r2dbc/dialect/PostgresDialect.java b/src/main/java/org/springframework/data/r2dbc/dialect/PostgresDialect.java
index c2b96a4..31a6cd1 100644
--- a/src/main/java/org/springframework/data/r2dbc/dialect/PostgresDialect.java
+++ b/src/main/java/org/springframework/data/r2dbc/dialect/PostgresDialect.java
@@ -86,7 +86,7 @@ public class PostgresDialect extends org.springframework.data.relational.core.di
 				typeToUse = typeToUse.getComponentType();
 			}
 
-			if (!simpleTypeHolder.isSimpleType(typeToUse)) {
+			if (!this.simpleTypeHolder.isSimpleType(typeToUse)) {
 				throw new IllegalArgumentException("Unsupported array type: " + ClassUtils.getQualifiedName(typeToUse));
 			}